From: sunliming sunliming@kylinos.cn
commit f6d026eea390d59787a6cdc2ef5c983d02e029d0 upstream.
The writing operation return the count of writes regardless of whether events are enabled or disabled. Switch it to return -EBADF to indicates that the event is disabled.
Link: https://lkml.kernel.org/r/20230626111344.19136-2-sunliming@kylinos.cn
Cc: stable@vger.kernel.org 7f5a08c79df35 ("user_events: Add minimal support for trace_event into ftrace") Acked-by: Beau Belgrave beaub@linux.microsoft.com Signed-off-by: sunliming sunliming@kylinos.cn Signed-off-by: Steven Rostedt (Google) rostedt@goodmis.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- kernel/trace/trace_events_user.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/kernel/trace/trace_events_user.c +++ b/kernel/trace/trace_events_user.c @@ -2096,7 +2096,8 @@ static ssize_t user_events_write_core(st
if (unlikely(faulted)) return -EFAULT; - } + } else + return -EBADF;
return ret; }